Douglas Brinkley is the William Ginsburg of the Kennedy death circus. Before the crash, the boyish, gap-toothed Brinkley was known primarily as a Michael Beschloss-in-waiting, a telegenic historian fielding calls from the cable news networks. Now the University of New Orleans professor has parlayed a contributing editorship at George and a friendship with Kennedy into a job as a necropublicist. Between Saturday and Tuesday, Brinkley appeared on MSNBC, Late Edition, Meet the Press, Good Morning America, Dateline, Today (twice), and NPR (twice). He also penned columns about his relationship with Kennedy for Newsweek and the New York Times, and was...